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EUSL Staff Research Collection: Recent submissions

  • The role of the electromagnetic field in dissipative collapse 
    Thirukkanesh, S; Govender, M (International Journal of Modern Physics, 2013)
    In this paper, we investigate the effect of charge on the collapse of a radiating, shearing sphere. The junction conditions required for the smooth matching of a general spherically symmetric spacetime (in the absence of ...
  • Causal heat flow in Bianchi type-V Universe 
    Govender, M; Thirukkanesh, S. (International Journal of Modern Physics, 2014)
    In this paper we investigate the role of causal heat transport in a spatially homogeneous, locally-rotationally symmetric Bianchi type-V cosmological model. In particular, the causal temperature profile of the cosmological ...
  • Spherically symmetric static matter configurations with vanishing radial pressure 
    Thirukkanesh, S.; Govender, M; Lortan, D. B (International Journal of Modern Physics, 2015)
    We present a new family of spherically symmetric, static solutions of the Einstein field equations in isotropic, comoving coordinates. The radial pressure at each interior point of these models vanishes yet equilibrium is ...
  • Anisotropic static spheres with linear equation of state in isotropic coordinates 
    Govender, M; Thirukkanesh, S. (Astrophysics and Space Science, 2015)
    In this paper we present a general framework for generating exact solutions to the Einstein field equations for static, anisotropic fluid spheres in comoving, isotropic coordinates obeying a linear equation of state of the ...
  • Radiating fluid sphere immersed in an anisotropic atmosphere 
    Naidu, N. F; Govender, M; Thirukkanesh, S; Maharaj, S. D (General Relativity and Gravitation, 2017)
    We model a radiating star undergoing dissipative gravitational collapse in the form of radial heat flux. The exterior of the collapsing star is described by the generalised Vaidya solution representing a mixture of null ...
  • Anisotropic extension of Finch and Skea stellar model Astrophysics and Space Science 
    Sharma Ranjan; Das Shyam; Thirukkanesh, S. (Astrophysics and Space Science, 2017)
    In this paper, the spacetime geometry of Finch and Skea [Class. Quantum Grav., 6 (1989) 467] has been utilized to obtain closed-form solutions for a spherically symmetric anisotropic matter distribution. By examining its ...
  • General relativistic model for mixed fluid sphere with equation of state 
    Ragel, F. C.; Thirukkanesh, S. (The European Physical Journal, 2019)
    We generate a general frame work to solve the Einstein system with an equation of state that describe static spherically symmetric anisotropic matter distribution in terms of a generating function. It is examined for a Van ...
  • Mixed potentials in radiative stellar collapse 
    Thirukkanesh, S.; Maharaj, S. D. (Journal of Mathematical Physics, 2010)
    We study the behaviour of a radiating star when the interior expanding, shearing fluid particles are traveling in geodesic motion. We demonstrate that it is possible to obtain new classes of exact solutions in terms of ...
  • Shearing radiative collapse with expansion and acceleration 
    Thirukkanesh, S.; Rajah, S. S.; Maharaj, S. D. (Journal of Mathematical Physics, 2012)
    We investigate the behaviour of a relativistic spherically symmetric radiative star with an accelerating, expanding and shearing interior matter distribution in the presence of anisotropic pressures. The junction condition ...
  • New Classes of Charged Spheroidal Models 
    Thirukkanesh, S (Journal of Astrophysics, 2013)
    New classes of exact solutions to the Einstein-Maxwell system is found in closed form by assuming that the hypersurface t =constant is spheroidal. This is achieved by choosing a particular form for the electric field ...
  • Transition from dense Kondo to the intermediate-valence regime in the Ce (Pt1-xNix)2Si2 alloys 
    Ragel, F. C.; P de V du Plessis (Journal of Physics: Condensed Matter, 2004)
    Electrical resistivity ρ(T) measurements on polycrystalline samples of the Ce (Pt1−xNix)2Si2 system exhibit dense Kondo behaviour for alloys with . The temperature at which a maximum appears in ρ(T) shifts from Tmax = 65 ...
  • Competing effects by Y dilution in CeNiAl4 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Solid State Communications, 2007)
    The occurrence of a maximum at a temperature T-max in the resistivity of the dense Kondo compound CeNiAl4 and in (Ce1-x,Y-x)NiAl4 alloys is investigated. Tmax (proportional to T-K, the Kondo temperature) first increases, ...
  • Electrical transport of Ce(Pt1-xNix)Ga and CePt(Ga1-yAly) alloys 
    Ragel, F. C.; P de V du Plessis; A M Strydom (ELSEVIER SCIENCE BV, 2007)
    Electrical resistivity results of Ce(Pt1-xNi)Ga and CePt(Ga1-yAl) alloys show features at low temperature indicating antiferromagnetic ordering and Kondo behaviour. The variation of Néel temperature with alloy composition ...
  • Chemical pressure and magnetic field effects in CePtGa 
    Ragel, F. C.; P de V du Plessis; A M Strydom (IOP PUBLISHING LTD, 2007)
    The antiferromagnetic Kondo compound CePtGa and the Ce(Pt1−xNix)Ga and CePt(Ga1−yAly) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples ...
  • Effects of La dilution on the CePt2Si2 Kondo lattice 
    Ragel, F. C.; P de V du Plessis; A M Strydom (IOP PUBLISHING LTD, 2008)
    Electrical resistivity (ρ(T)) and magnetoresistivity (MR) measurements are presented for the (Ce1−xLax)Pt2Si2 alloy system. ρ(T) data at low temperatures for alloys in the concentrated Kondo lattice regime 0≤x≤0.2 conform ...
  • Dilution and Non-Fermi-liquid effects in the CePtIn Kondo lattice 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Journal of Physics, 2009)
    Measurements of electrical resistivity (ρ(T)), magnetoresistivity (MR), magnetic susceptibility (χ(T)) and heat capacity (CP(T)) are presented for the (Ce1−xLax)PtIn alloy system of which the CePtIn parent is a known dense ...
  • Kondo behaviour of the solid solution (Ce1-xLax)PtGa 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Journal of Physics and Chemistry of Solids, 2010)
    The solid solution (Ce1−xLax)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (CP(T)) measurements. ...
  • Exact anisotropic sphere with polytropic equation of state 
    Thirukkanesh, S.; Ragel, F. C. (Pramana-Journal of Physics, 2012)
    We study static spherically symmetric spacetime to describe compact objects with anisotropic matter distribution. We express the system of Einstein field equations as a new system of differential equations using a coordinate ...
  • A class of exact strange quark star model 
    Thirukkanesh, S.; Ragel, F. C. (Pramana-Journal of Physics, 2013)
    Static spherically symmetric space-time is studied to describe dense compact star with quark matter within the framework of MIT Bag Model. The system of Einstein’s field equations for anisotropic matter is expressed as ...
  • Anisotropic spheres with Van der Waals-type equation of state 
    Thirukkanesh, S.; Ragel, F. C. (INDIAN ACAD SCIENCES and SPRINGER, 2014)
    We study static spherically symmetric space-time to describe relativistic compact objects with anisotropic matter distribution and derive two classes of exact models to the Einstein–Maxwell system with a modified Van der ...

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